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A library jar that provides APIs for Applications written for the Google Android Platform.
/*
* Copyright (C) 2009 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.android.internal.os;
import android.content.Context;
import android.content.res.XmlResourceParser;
import com.android.internal.util.XmlUtils;
import org.xmlpull.v1.XmlPullParser;
import org.xmlpull.v1.XmlPullParserException;
import java.io.IOException;
import java.util.ArrayList;
import java.util.HashMap;
/**
* Reports power consumption values for various device activities. Reads values from an XML file.
* Customize the XML file for different devices.
* [hidden]
*/
public class PowerProfile {
/**
* No power consumption, or accounted for elsewhere.
*/
public static final String POWER_NONE = "none";
/**
* Power consumption when CPU is in power collapse mode.
*/
public static final String POWER_CPU_IDLE = "cpu.idle";
/**
* Power consumption when CPU is awake (when a wake lock is held). This
* should be 0 on devices that can go into full CPU power collapse even
* when a wake lock is held. Otherwise, this is the power consumption in
* addition to POWERR_CPU_IDLE due to a wake lock being held but with no
* CPU activity.
*/
public static final String POWER_CPU_AWAKE = "cpu.awake";
/**
* Power consumption when CPU is in power collapse mode.
*/
public static final String POWER_CPU_ACTIVE = "cpu.active";
/**
* Power consumption when WiFi driver is scanning for networks.
*/
public static final String POWER_WIFI_SCAN = "wifi.scan";
/**
* Power consumption when WiFi driver is on.
*/
public static final String POWER_WIFI_ON = "wifi.on";
/**
* Power consumption when WiFi driver is transmitting/receiving.
*/
public static final String POWER_WIFI_ACTIVE = "wifi.active";
/**
* Power consumption when GPS is on.
*/
public static final String POWER_GPS_ON = "gps.on";
/**
* Power consumption when Bluetooth driver is on.
*/
public static final String POWER_BLUETOOTH_ON = "bluetooth.on";
/**
* Power consumption when Bluetooth driver is transmitting/receiving.
*/
public static final String POWER_BLUETOOTH_ACTIVE = "bluetooth.active";
/**
* Power consumption when Bluetooth driver gets an AT command.
*/
public static final String POWER_BLUETOOTH_AT_CMD = "bluetooth.at";
/**
* Power consumption when screen is on, not including the backlight power.
*/
public static final String POWER_SCREEN_ON = "screen.on";
/**
* Power consumption when cell radio is on but not on a call.
*/
public static final String POWER_RADIO_ON = "radio.on";
/**
* Power consumption when cell radio is hunting for a signal.
*/
public static final String POWER_RADIO_SCANNING = "radio.scanning";
/**
* Power consumption when talking on the phone.
*/
public static final String POWER_RADIO_ACTIVE = "radio.active";
/**
* Power consumption at full backlight brightness. If the backlight is at
* 50% brightness, then this should be multiplied by 0.5
*/
public static final String POWER_SCREEN_FULL = "screen.full";
/**
* Power consumed by the audio hardware when playing back audio content. This is in addition
* to the CPU power, probably due to a DSP and / or amplifier.
*/
public static final String POWER_AUDIO = "dsp.audio";
/**
* Power consumed by any media hardware when playing back video content. This is in addition
* to the CPU power, probably due to a DSP.
*/
public static final String POWER_VIDEO = "dsp.video";
/**
* Power consumption when camera flashlight is on.
*/
public static final String POWER_FLASHLIGHT = "camera.flashlight";
public static final String POWER_CPU_SPEEDS = "cpu.speeds";
/**
* Power consumed by wif batched scaning. Broken down into bins by
* Channels Scanned per Hour. May do 1-720 scans per hour of 1-100 channels
* for a range of 1-72,000. Going logrithmic (1-8, 9-64, 65-512, 513-4096, 4097-)!
*/
public static final String POWER_WIFI_BATCHED_SCAN = "wifi.batchedscan";
/**
* Battery capacity in milliAmpHour (mAh).
*/
public static final String POWER_BATTERY_CAPACITY = "battery.capacity";
static final HashMap sPowerMap = new HashMap();
private static final String TAG_DEVICE = "device";
private static final String TAG_ITEM = "item";
private static final String TAG_ARRAY = "array";
private static final String TAG_ARRAYITEM = "value";
private static final String ATTR_NAME = "name";
public PowerProfile(Context context) {
// Read the XML file for the given profile (normally only one per
// device)
if (sPowerMap.size() == 0) {
readPowerValuesFromXml(context);
}
}
private void readPowerValuesFromXml(Context context) {
int id = com.android.internal.R.xml.power_profile;
XmlResourceParser parser = context.getResources().getXml(id);
boolean parsingArray = false;
ArrayList array = new ArrayList();
String arrayName = null;
try {
XmlUtils.beginDocument(parser, TAG_DEVICE);
while (true) {
XmlUtils.nextElement(parser);
String element = parser.getName();
if (element == null) break;
if (parsingArray && !element.equals(TAG_ARRAYITEM)) {
// Finish array
sPowerMap.put(arrayName, array.toArray(new Double[array.size()]));
parsingArray = false;
}
if (element.equals(TAG_ARRAY)) {
parsingArray = true;
array.clear();
arrayName = parser.getAttributeValue(null, ATTR_NAME);
} else if (element.equals(TAG_ITEM) || element.equals(TAG_ARRAYITEM)) {
String name = null;
if (!parsingArray) name = parser.getAttributeValue(null, ATTR_NAME);
if (parser.next() == XmlPullParser.TEXT) {
String power = parser.getText();
double value = 0;
try {
value = Double.valueOf(power);
} catch (NumberFormatException nfe) {
}
if (element.equals(TAG_ITEM)) {
sPowerMap.put(name, value);
} else if (parsingArray) {
array.add(value);
}
}
}
}
if (parsingArray) {
sPowerMap.put(arrayName, array.toArray(new Double[array.size()]));
}
} catch (XmlPullParserException e) {
throw new RuntimeException(e);
} catch (IOException e) {
throw new RuntimeException(e);
} finally {
parser.close();
}
}
/**
* Returns the average current in mA consumed by the subsystem
* @param type the subsystem type
* @return the average current in milliAmps.
*/
public double getAveragePower(String type) {
if (sPowerMap.containsKey(type)) {
Object data = sPowerMap.get(type);
if (data instanceof Double[]) {
return ((Double[])data)[0];
} else {
return (Double) sPowerMap.get(type);
}
} else {
return 0;
}
}
/**
* Returns the average current in mA consumed by the subsystem for the given level.
* @param type the subsystem type
* @param level the level of power at which the subsystem is running. For instance, the
* signal strength of the cell network between 0 and 4 (if there are 4 bars max.)
* If there is no data for multiple levels, the level is ignored.
* @return the average current in milliAmps.
*/
public double getAveragePower(String type, int level) {
if (sPowerMap.containsKey(type)) {
Object data = sPowerMap.get(type);
if (data instanceof Double[]) {
final Double[] values = (Double[]) data;
if (values.length > level && level >= 0) {
return values[level];
} else if (level < 0) {
return 0;
} else {
return values[values.length - 1];
}
} else {
return (Double) data;
}
} else {
return 0;
}
}
/**
* Returns the battery capacity, if available, in milli Amp Hours. If not available,
* it returns zero.
* @return the battery capacity in mAh
*/
public double getBatteryCapacity() {
return getAveragePower(POWER_BATTERY_CAPACITY);
}
/**
* Returns the number of speeds that the CPU can be run at.
* @return
*/
public int getNumSpeedSteps() {
Object value = sPowerMap.get(POWER_CPU_SPEEDS);
if (value != null && value instanceof Double[]) {
return ((Double[])value).length;
}
return 1; // Only one speed
}
}